EP2775152B1 - Hydraulic cylinder and method for manufacturing same - Google Patents
Hydraulic cylinder and method for manufacturing same Download PDFInfo
- Publication number
- EP2775152B1 EP2775152B1 EP12846284.3A EP12846284A EP2775152B1 EP 2775152 B1 EP2775152 B1 EP 2775152B1 EP 12846284 A EP12846284 A EP 12846284A EP 2775152 B1 EP2775152 B1 EP 2775152B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- head
- piston rod
- shaft hole
- hole
- fluid pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000012530 fluid Substances 0.000 claims description 36
- 238000005520 cutting process Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 238000000638 solvent extraction Methods 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 description 8
- 238000003754 machining Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
- F16J10/02—Cylinders designed to receive moving pistons or plungers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/4927—Cylinder, cylinder head or engine valve sleeve making
Definitions
- the present invention relates to a fluid pressure cylinder that is expanded and contracted by a working fluid pressure introduced from an external working fluid pressure source and a manufacturing method therefor.
- JP2003-166508A discloses a fluid pressure cylinder in which a head-side passage allowing communication between a head-side chamber and a working fluid pressure source and a bottom-side passage allowing communication between a bottom-side chamber and the working fluid pressure source are provided in a piston rod.
- the head-side passage and the bottom-side passage are respectively defined by two shaft holes formed in the solid piston rod. These two shaft holes are formed by inserting cutting tools (drills) through a tip surface of the piston rod to be located in the bottom-side chamber.
- the head-side passage is a passage allowing communication between the working fluid pressure source and the head-side chamber and needs to be sealed so as not to communicate with the bottom-side chamber.
- a sealing member such as a plug is embedded at an opening end of the shaft hole (head-side shaft hole) defining the head-side passage and open to the bottom-side chamber.
- the sealing member embedded at the opening end of the head-side shaft hole may possibly come off into the bottom-side chamber, i.e. a cylinder tube.
- a hydraulic cylinder (fluid pressure cylinder) 1 includes a tubular cylinder tube 10, a piston 20 partitioning the interior of the hydraulic cylinder 10 into a head-side chamber 2 and a bottom-side chamber 3, and a piston rod 30 coupled to the piston 20.
- the hydraulic cylinder 1 is a single rod type and the piston rod 30 projects from one end of the cylinder tube 10.
- the head-side chamber 2 is provided on a head side where the piston rod 30 projects from the cylinder tube 10, and defined by the cylinder tube 10, the piston 20, the piston rod 30 and a cylinder head 40 to be described later.
- the bottom-side chamber 3 is provided on a bottom side where the piston rod 30 does not project from the cylinder tube 10, and defined by the cylinder tube 10, the piston 20 and a bottom bracket 50 to be described later.
- the piston rod 30 is moved in a direction of a center axis O relative to the cylinder tube 10 by a hydraulic oil pressure (working fluid pressure) introduced from an unillustrated hydraulic pressure source (working fluid pressure source).
- working fluid pressure working fluid pressure
- hydraulic oil oil
- working liquid such as water-soluble alternative liquid may be used instead of the hydraulic oil.
- the cylinder tube 10 is formed into a hollow cylindrical shape.
- the cylinder head 40 allowing the piston rod 30 to be slidably inserted therethrough is fastened to a tip side opening (upper end in FIG. 1 ) 10A of the cylinder tube 10.
- the cylinder head 40 slidably supports the piston rod 30 via a bearing 6.
- cylinder tube 10 and the cylinder head 40 may be integrally formed.
- the bottom bracket 50 is joined to a base end side opening (lower end in FIG. 1 ) 10B of the cylinder tube 10.
- the bottom bracket 50 is provided with an annular eye portion 51.
- a bush (bearing) 8 is fitted to the eye portion 51.
- a base end part of the cylinder tube 10 is coupled to the driven body via an unillustrated pin inserted into the bush 8.
- the piston rod 30 is formed into a solid cylindrical shape.
- the piston rod 30 includes a right cylindrical rod main body 33 slidably supported in the cylinder head 40, a pipe connecting portion 35 provided on a base end side (upper end side in FIG. 1 ) of the rod main body 33 and an annular eye portion 34 provided on a base end side of the pipe connecting portion 35.
- a bush (bearing) 9 is fitted to the eye portion 34.
- a base end part of the piston rod 30 is coupled to the driving body via an unillustrated pin inserted into the bush 9.
- the bush 9 may be omitted and the base end part of the piston rod 30 may be coupled to the driving body via an unillustrated pin directly inserted into the eye portion 34.
- a tip part of the piston rod 30 includes the rod main body 33, a piston supporting portion 31 and a tip screw portion 32 and is so formed that the outer diameter thereof becomes smaller stepwise.
- the piston 20 is fitted to the piston supporting portion 31 and fastened by a nut 5 threadably engaged with the tip screw portion 32.
- an annular groove 37 is formed between the rod main body 33 and the piston supporting portion 31.
- the piston rod 30 supports the piston 20 by the piston supporting portion 31 and the tip screw portion 32.
- Outer diameters of the piston supporting portion 31 and the tip screw portion 32 of the piston rod 30 are smaller than that of the rod main body 33 and an outer diameter of the pipe connecting portion 35 is larger than that of the rod main body 33.
- piston rod 30 and the piston 20 may be integrally formed.
- a head-side passage 11 allowing the head-side chamber 2 to communicate with the hydraulic pressure source and a bottom-side passage 21 allowing the bottom-side chamber 3 to communicate with the hydraulic pressure source are provided in the solid piston rod 30.
- the head-side chamber 2 and the bottom-side chamber 3 communicate with the common hydraulic pressure source. It should be noted that the head-side chamber 2 and the bottom-side chamber 3 may communicate with different hydraulic pressure sources.
- the pipe connecting portion 35 is provided between the rod main body 33 and the eye portion 34 on the base end part of the piston rod 30.
- a pipe (not shown) allowing the head-side passage 11 and the bottom-side passage 21 to respectively communicate with the hydraulic pressure source is connected to the pipe connecting portion 35.
- FIG. 1 shows a state where the hydraulic cylinder 1 is contracted.
- the pressurized hydraulic oil supplied from a pump discharge side of the hydraulic pressure source flows into the bottom-side chamber 3 through the bottom-side passage 21.
- This causes the piston 20 to move to the head side (upper side in FIG. 1 ), whereby the hydraulic oil in the head-side chamber 2 flows out to a tank side of the hydraulic pressure source through the head-side passage 11.
- the hydraulic cylinder 1 when the hydraulic cylinder 1 is contracted, the pressurized hydraulic oil supplied from the pump discharge side of the hydraulic pressure source flows into the head-side chamber 2 through the head-side passage 11.
- the head-side passage 11 includes a head-side shaft hole 12 extending in the direction of the center axis O of the piston rod 30, a head-side outer hole (screw hole) 13 open on the pipe connecting portion 35 of the piston rod 30, and a head-side inner hole (lateral hole) 14 facing the head-side chamber 2 and open on the rod main body 33.
- the head-side shaft hole 12, the head-side outer hole 13 and the head-side inner hole 14 are respectively formed by machining.
- the bottom-side passage 21 includes a bottom-side shaft hole 22 extending in the direction of the center axis O of the piston rod 30, a bottom-side outer hole (screw hole) 23 open on the pipe connecting portion 35 of the piston rod 30, and a groove 24 facing the bottom-side chamber 3 and open on the rod main body 33.
- the bottom-side shaft hole 22, the bottom-side outer hole 23 and the groove 24 are respectively formed by machining.
- the head-side and bottom-side shaft holes 12, 22 are formed by inserting cutting tools 61, 62 in directions opposite to each other along the direction of the center axis O of the piston rod 30.
- the head-side shaft hole 12 is formed by inserting the cutting tool (drill) 61 through an eye portion outer peripheral surface 34B (part of the piston rod 30 projecting from the cylinder tube 10). As shown by arrows in FIG. 2 , the cutting tool 61 moves in the direction of the center axis O of the piston rod 30 to form the head-side shaft hole 12 by cutting. In this way, the head-side shaft hole 12 including an opening end 12A open on the part of the piston rod 30 projecting from the cylinder tube 10 and a tip 12B formed inside the piston rod 30 is formed.
- the bottom-side shaft hole 22 is formed by inserting the cutting tool (drill) 62 through a tip surface 36 (part of the piston rod 30 to be located in the cylinder tube 10). As shown by arrows in FIG. 2 , the cutting tool 62 moves in the direction of the center axis O of the piston rod 30 to form the bottom-side shaft hole 22 by cutting. In this way, the bottom-side shaft hole 22 including an opening end 22A communicating with the bottom-side chamber 3 and a tip 22B formed inside the piston rod 30 is formed.
- the head-side passage forming process and the bottom-side passage forming process are performed in parallel.
- a machining time can be reduced by substantially simultaneously inserting the cutting tools 61, 62 in the directions opposite to each other along the direction of the center axis O of the piston rod 30 to form the head-side shaft hole 12 and the bottom-side shaft hole 22.
- bottom-side passage forming process of forming the bottom-side shaft hole 22 may be performed with the orientation of the piston rod 30 supported in a machining apparatus reversed after the head-side passage forming process of forming the head-side shaft hole 12 is performed.
- the tip 12B of the head-side shaft hole 12 is arranged at a position in the rod main body 33 before the piston supporting portion 31 and does not communicate with the bottom-side chamber 3.
- the tip 12B of the head-side shaft hole 12 is located closer to the opening end 12A of the head-side shaft hole 12 than a part of the piston rod 30 supporting the piston 20, and connected to the head-side inner hole 14 formed later.
- the head-side shaft hole 12 may be so formed that the tip 12B reaches the piston supporting portion 31 or the tip screw portion 32 as long as it is so structured as not to be open to the bottom-side chamber 3.
- the bottom-side shaft hole 22 is continuously arranged in the tip screw portion 32, the piston supporting portion 31 and the rod main body 33 and connected to the hole 23 formed later.
- the head-side shaft hole 12 is not formed and only the bottom-side shaft hole 22 is formed. This can avoid a reduction in a cross-sectional area of the piston rod 30 in the piston supporting portion 31 and the tip screw portion 32 having smaller outer diameters and a reduction in strength against a load received from the piston 20.
- an inner plug hole 15 open on an inner peripheral surface 34A of the eye portion 34 and an outer plug hole 16 open on each of the inner peripheral surface 34A and an outer peripheral surface 34B of the eye portion 34 are successively coaxially formed.
- the head-side shaft hole 12, the inner plug hole 15 and the outer plug hole 16 are so formed that opening diameters thereof are larger in this order.
- unillustrated cutting tools are inserted through an outer peripheral surface 30A of the piston rod 30 in directions substantially perpendicular to the direction of the center axis O of the piston rod 30.
- the head-side outer hole 13, the bottom-side outer hole 23 and the head-side inner hoe 14 open on the outer peripheral surface 30A of the piston rod 30 are respectively formed to extend in the directions substantially perpendicular to the direction of the center axis O of the piston rod 30.
- the groove 24 open on the top surface 36 of the piston rod 30 is formed by machining.
- the inner plug hole 15 is formed with an internal thread and a plug 17 is mounted by being threadably engaged. It should be noted that a plug may be mounted into the inner plug hole 15 by being press-fitted. By embedding the plug 17 into the inner plug hole 15, one end of the head-side passage 11 can be sealed to prevent the leakage of the hydraulic oil to outside. It should be noted that the sealing member is not limited to the plug 17 and the communication of the head-side shaft hole 12 with the outside may be blocked using another member such as a driving plug or a steel ball.
- the outer plug hole 16 is formed with an internal thread and a plug 18 is mounted by being threadably engaged. It should be noted that a plug may be mounted into the outer plug hole 16 by being press-fitted. By embedding the plug 18 into the outer plug hole 16, the entrance of foreign matters via the outer plug hole 16 is prevented and the rigidity of the eye portion 34 is improved.
- the plug 17 is first mounted into the inner plug hole 15. Thereafter, the bush 9 is mounted on the inner peripheral surface 34A of the eye portion 34. Finally, the plug 18 is mounted into the outer plug hole 16.
- the plugs 17, 18 are provided in the part of the piston rod 30 projecting out from the cylinder tube 10, even if the plug comes out from the inner or outer plug hole 15 or 16, the fall thereof into the cylinder tube 10 is avoided.
- the fluid pressure cylinder (hydraulic cylinder 1) which is expanded and contracted by the working fluid pressure introduced from the external working fluid pressure source.
- the fluid pressure cylinder (hydraulic cylinder 1) of the present embodiment includes the tubular cylinder tube 10, the piston 20 partitioning the interior of the cylinder tube 10 into the head-side chamber 2 and the bottom-side chamber 3 and the piston rod 30 coupled to the piston 20.
- the solid piston rod 30 is internally provided with the head-side passage 11 and the bottom-side passage 21.
- the head-side passage 11 is defined by the head-side shaft hole 12 extending in an axial direction of the piston rod 30, the head-side outer hole 13 connected to the head-side shaft hole 12 and open on the part of the piston rod 30 projecting from the cylinder tube 10 and the head-side inner hole 14 connected to the head-side shaft hole 12 and open to the head-side chamber 2, and allows the head-side chamber 2 to communicate with the working fluid pressure source via the head-side inner hole 14, the head-side shaft hole 12 and the head-side outer hole 13.
- the bottom-side passage 21 allows the bottom-side chamber 3 to communicate with the working fluid pressure source.
- the head-side shaft hole 12 includes the opening end 12A open on the part of the piston rod 30 projecting from the cylinder tube 10 and the tip 12B formed inside the piston rod 30.
- the fluid pressure cylinder further includes the sealing member (plug 17) for sealing the opening end 12A of the head-side shaft hole 12.
- the working fluid is supplied and discharged between the head-side chamber 2 and the working fluid pressure source via the head-side shaft hole 12, the head-side outer hole 13 and the head-side inner hole 14.
- the head-side shaft hole 12 is structured to include no opening end in the bottom-side chamber 3, a sealing member for closing the head-side shaft hole 12 and the bottom-side chamber 3 is not provided in the first place and there is no likelihood that such a sealing member or the like comes off into the cylinder tube 10.
- the tip 12B of the head-side shaft hole 12 is located closer to the opening end 12A of the head-side shaft hole 12 than the part of the piston rod 30 supporting the piston 20.
- the bottom-side passage 21 is defined by the bottom-side shaft hole 22 including the opening end 22A open to the bottom-side chamber 3 and extending in the axial direction (direction of the center axis O) of the piston rod 30 beyond the part of the piston rod 30 supporting the piston 20.
- the conventional fluid pressure cylinder is so structured that the two shaft holes defining the head-side passage and the bottom-side passage penetrate through the piston supporting portion of the piston rod.
- a cross-sectional area of the piston supporting portion is reduced by the two penetrating shaft holes despite the piston supporting portion being a part where the outer diameter of the piston rod is small and the strength of the piston rod is impaired.
- the strength of the piston rod 30 can be improved as compared with the conventional fluid pressure cylinder.
- the piston rod 30 includes the annular eye portion 34 on the part projecting from the cylinder tube 10.
- the inner plug hole 15 open on the inner peripheral surface 34A of the eye portion 34 is formed at the opening end 12A of the head-side shaft hole 12.
- the plug 17 as the sealing member for sealing the opening end 12A of the head-side shaft hole 12 is embedded into the inner plug hole 15.
- the outer plug hole 16 open on the inner and outer peripheral surfaces 34A, 34B of the eye portion 34 is formed and the outer plug hole 16, the inner plug hole 15 and the head-side shaft hole 12 are coaxially formed.
- the method for manufacturing the fluid pressure cylinder (hydraulic cylinder 1) of the present embodiment includes the head-side passage forming process of forming the head-side passage 11 by the cutting tool 61 inserted through the part (eye portion outer peripheral surface 34B) of the piston rod 30 projecting from the cylinder tube 10 and the bottom-side passage forming process of forming the bottom-side passage 21 by the cutting tool 62 inserted through the part (tip surface 36) of the piston rod 30 to be located in the cylinder tube 10.
- the head-side passage forming process and the bottom-side passage forming process are performed in parallel.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Actuator (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
- The present invention relates to a fluid pressure cylinder that is expanded and contracted by a working fluid pressure introduced from an external working fluid pressure source and a manufacturing method therefor.
-
JP2003-166508A - The head-side passage and the bottom-side passage are respectively defined by two shaft holes formed in the solid piston rod. These two shaft holes are formed by inserting cutting tools (drills) through a tip surface of the piston rod to be located in the bottom-side chamber.
- The head-side passage is a passage allowing communication between the working fluid pressure source and the head-side chamber and needs to be sealed so as not to communicate with the bottom-side chamber. Thus, a sealing member such as a plug is embedded at an opening end of the shaft hole (head-side shaft hole) defining the head-side passage and open to the bottom-side chamber.
- In the above conventional fluid pressure cylinder, however, the sealing member embedded at the opening end of the head-side shaft hole may possibly come off into the bottom-side chamber, i.e. a cylinder tube.
- It is an object of the present invention to provide a fluid pressure cylinder capable of preventing a sealing member for sealing an opening end of a shaft hole formed in a piston rod from coming off into a cylinder tube and a manufacturing method therefor.
- Preferred embodiments are described in the dependent claims.
- Embodiments of the present invention and advantages thereof are described in detail below with reference to the accompanying drawings.
-
-
FIG. 1 is a sectional view of a hydraulic cylinder according to an embodiment of the present invention, and -
FIG. 2 is a configuration diagram showing a method for manufacturing a piston rod. - Hereinafter, embodiments of the present invention are described with reference to the accompanying drawings.
- As shown in
FIG. 1 , a hydraulic cylinder (fluid pressure cylinder) 1 includes atubular cylinder tube 10, apiston 20 partitioning the interior of thehydraulic cylinder 10 into a head-side chamber 2 and a bottom-side chamber 3, and apiston rod 30 coupled to thepiston 20. - The hydraulic cylinder 1 is a single rod type and the
piston rod 30 projects from one end of thecylinder tube 10. The head-side chamber 2 is provided on a head side where thepiston rod 30 projects from thecylinder tube 10, and defined by thecylinder tube 10, thepiston 20, thepiston rod 30 and acylinder head 40 to be described later. The bottom-side chamber 3 is provided on a bottom side where thepiston rod 30 does not project from thecylinder tube 10, and defined by thecylinder tube 10, thepiston 20 and abottom bracket 50 to be described later. - The
piston rod 30 is moved in a direction of a center axis O relative to thecylinder tube 10 by a hydraulic oil pressure (working fluid pressure) introduced from an unillustrated hydraulic pressure source (working fluid pressure source). This causes the hydraulic cylinder 1 to expand and contract, whereby a driven body coupled to thecylinder tube 10 is driven relative to an unillustrated driving body coupled to thepiston rod 30. - Although the hydraulic cylinder 1 uses hydraulic oil (oil) as working fluid, working liquid such as water-soluble alternative liquid may be used instead of the hydraulic oil.
- The
cylinder tube 10 is formed into a hollow cylindrical shape. Thecylinder head 40 allowing thepiston rod 30 to be slidably inserted therethrough is fastened to a tip side opening (upper end inFIG. 1 ) 10A of thecylinder tube 10. Thecylinder head 40 slidably supports thepiston rod 30 via abearing 6. - It should be noted that the
cylinder tube 10 and thecylinder head 40 may be integrally formed. - The
bottom bracket 50 is joined to a base end side opening (lower end inFIG. 1 ) 10B of thecylinder tube 10. Thebottom bracket 50 is provided with anannular eye portion 51. A bush (bearing) 8 is fitted to theeye portion 51. A base end part of thecylinder tube 10 is coupled to the driven body via an unillustrated pin inserted into thebush 8. - The
piston rod 30 is formed into a solid cylindrical shape. Thepiston rod 30 includes a right cylindrical rodmain body 33 slidably supported in thecylinder head 40, apipe connecting portion 35 provided on a base end side (upper end side inFIG. 1 ) of the rodmain body 33 and anannular eye portion 34 provided on a base end side of thepipe connecting portion 35. - A bush (bearing) 9 is fitted to the
eye portion 34. A base end part of thepiston rod 30 is coupled to the driving body via an unillustrated pin inserted into thebush 9. - It should be noted that the
bush 9 may be omitted and the base end part of thepiston rod 30 may be coupled to the driving body via an unillustrated pin directly inserted into theeye portion 34. - A tip part of the
piston rod 30 includes the rodmain body 33, apiston supporting portion 31 and atip screw portion 32 and is so formed that the outer diameter thereof becomes smaller stepwise. Thepiston 20 is fitted to thepiston supporting portion 31 and fastened by anut 5 threadably engaged with thetip screw portion 32. To prevent the interference of thepiston rod 30 and an inner peripheral corner part of thepiston 20, anannular groove 37 is formed between the rodmain body 33 and thepiston supporting portion 31. Thepiston rod 30 supports thepiston 20 by thepiston supporting portion 31 and thetip screw portion 32. - Outer diameters of the
piston supporting portion 31 and thetip screw portion 32 of thepiston rod 30 are smaller than that of the rodmain body 33 and an outer diameter of thepipe connecting portion 35 is larger than that of the rodmain body 33. - It should be noted that the
piston rod 30 and thepiston 20 may be integrally formed. - A head-
side passage 11 allowing the head-side chamber 2 to communicate with the hydraulic pressure source and a bottom-side passage 21 allowing the bottom-side chamber 3 to communicate with the hydraulic pressure source are provided in thesolid piston rod 30. The head-side chamber 2 and the bottom-side chamber 3 communicate with the common hydraulic pressure source. It should be noted that the head-side chamber 2 and the bottom-side chamber 3 may communicate with different hydraulic pressure sources. - As described above, the
pipe connecting portion 35 is provided between the rodmain body 33 and theeye portion 34 on the base end part of thepiston rod 30. A pipe (not shown) allowing the head-side passage 11 and the bottom-side passage 21 to respectively communicate with the hydraulic pressure source is connected to thepipe connecting portion 35. -
FIG. 1 shows a state where the hydraulic cylinder 1 is contracted. When the hydraulic cylinder 1 is expanded, the pressurized hydraulic oil supplied from a pump discharge side of the hydraulic pressure source flows into the bottom-side chamber 3 through the bottom-side passage 21. This causes thepiston 20 to move to the head side (upper side inFIG. 1 ), whereby the hydraulic oil in the head-side chamber 2 flows out to a tank side of the hydraulic pressure source through the head-side passage 11. On the other hand, when the hydraulic cylinder 1 is contracted, the pressurized hydraulic oil supplied from the pump discharge side of the hydraulic pressure source flows into the head-side chamber 2 through the head-side passage 11. This causes thepiston 20 to move to the bottom side (lower side inFIG. 1 ), whereby the hydraulic oil in the bottom-side chamber 3 flows out to the tank side of the hydraulic pressure source through the bottom-side passage 21. - The head-
side passage 11 includes a head-side shaft hole 12 extending in the direction of the center axis O of thepiston rod 30, a head-side outer hole (screw hole) 13 open on thepipe connecting portion 35 of thepiston rod 30, and a head-side inner hole (lateral hole) 14 facing the head-side chamber 2 and open on the rodmain body 33. The head-side shaft hole 12, the head-sideouter hole 13 and the head-sideinner hole 14 are respectively formed by machining. - The bottom-
side passage 21 includes a bottom-side shaft hole 22 extending in the direction of the center axis O of thepiston rod 30, a bottom-side outer hole (screw hole) 23 open on thepipe connecting portion 35 of thepiston rod 30, and agroove 24 facing the bottom-side chamber 3 and open on the rodmain body 33. The bottom-side shaft hole 22, the bottom-sideouter hole 23 and thegroove 24 are respectively formed by machining. - Next, a process of forming the head-
side passage 11 and the bottom-side passage 21 in the piston rod 30 (head-side, bottom-side passage forming processes) is described. As shown inFIG. 2 , the head-side and bottom-side shaft holes cutting tools piston rod 30. - In the head-side passage forming process of forming the head-
side passage 11, the head-side shaft hole 12 is formed by inserting the cutting tool (drill) 61 through an eye portion outerperipheral surface 34B (part of thepiston rod 30 projecting from the cylinder tube 10). As shown by arrows inFIG. 2 , thecutting tool 61 moves in the direction of the center axis O of thepiston rod 30 to form the head-side shaft hole 12 by cutting. In this way, the head-side shaft hole 12 including anopening end 12A open on the part of thepiston rod 30 projecting from thecylinder tube 10 and atip 12B formed inside thepiston rod 30 is formed. - In the bottom-side passage forming process of forming the bottom-
side passage 21, the bottom-side shaft hole 22 is formed by inserting the cutting tool (drill) 62 through a tip surface 36 (part of thepiston rod 30 to be located in the cylinder tube 10). As shown by arrows inFIG. 2 , the cuttingtool 62 moves in the direction of the center axis O of thepiston rod 30 to form the bottom-side shaft hole 22 by cutting. In this way, the bottom-side shaft hole 22 including anopening end 22A communicating with the bottom-side chamber 3 and atip 22B formed inside thepiston rod 30 is formed. - The head-side passage forming process and the bottom-side passage forming process are performed in parallel. A machining time can be reduced by substantially simultaneously inserting the
cutting tools piston rod 30 to form the head-side shaft hole 12 and the bottom-side shaft hole 22. - It should be noted that the bottom-side passage forming process of forming the bottom-
side shaft hole 22 may be performed with the orientation of thepiston rod 30 supported in a machining apparatus reversed after the head-side passage forming process of forming the head-side shaft hole 12 is performed. - The
tip 12B of the head-side shaft hole 12 is arranged at a position in the rodmain body 33 before thepiston supporting portion 31 and does not communicate with the bottom-side chamber 3. In other words, thetip 12B of the head-side shaft hole 12 is located closer to the openingend 12A of the head-side shaft hole 12 than a part of thepiston rod 30 supporting thepiston 20, and connected to the head-sideinner hole 14 formed later. It should be noted that the head-side shaft hole 12 may be so formed that thetip 12B reaches thepiston supporting portion 31 or thetip screw portion 32 as long as it is so structured as not to be open to the bottom-side chamber 3. - The bottom-
side shaft hole 22 is continuously arranged in thetip screw portion 32, thepiston supporting portion 31 and the rodmain body 33 and connected to thehole 23 formed later. - In the
piston supporting portion 31 and thetip screw portion 32 of thepiston rod 30, the head-side shaft hole 12 is not formed and only the bottom-side shaft hole 22 is formed. This can avoid a reduction in a cross-sectional area of thepiston rod 30 in thepiston supporting portion 31 and thetip screw portion 32 having smaller outer diameters and a reduction in strength against a load received from thepiston 20. - After the head-
side shaft hole 12 is formed in thepiston rod 30, aninner plug hole 15 open on an innerperipheral surface 34A of theeye portion 34 and an outer plug hole 16 open on each of the innerperipheral surface 34A and an outerperipheral surface 34B of theeye portion 34 are successively coaxially formed. The head-side shaft hole 12, theinner plug hole 15 and the outer plug hole 16 are so formed that opening diameters thereof are larger in this order. - In a process of forming the head-side
outer hole 13, the bottom-sideouter hole 23 and the head-sideinner hole 14, unillustrated cutting tools (drills) are inserted through an outerperipheral surface 30A of thepiston rod 30 in directions substantially perpendicular to the direction of the center axis O of thepiston rod 30. In this way, the head-sideouter hole 13, the bottom-sideouter hole 23 and the head-sideinner hoe 14 open on the outerperipheral surface 30A of thepiston rod 30 are respectively formed to extend in the directions substantially perpendicular to the direction of the center axis O of thepiston rod 30. Thegroove 24 open on thetop surface 36 of thepiston rod 30 is formed by machining. - As a sealing member for sealing the opening
end 12A of the head-side shaft hole 12, theinner plug hole 15 is formed with an internal thread and aplug 17 is mounted by being threadably engaged. It should be noted that a plug may be mounted into theinner plug hole 15 by being press-fitted. By embedding theplug 17 into theinner plug hole 15, one end of the head-side passage 11 can be sealed to prevent the leakage of the hydraulic oil to outside. It should be noted that the sealing member is not limited to theplug 17 and the communication of the head-side shaft hole 12 with the outside may be blocked using another member such as a driving plug or a steel ball. - The outer plug hole 16 is formed with an internal thread and a
plug 18 is mounted by being threadably engaged. It should be noted that a plug may be mounted into the outer plug hole 16 by being press-fitted. By embedding theplug 18 into the outer plug hole 16, the entrance of foreign matters via the outer plug hole 16 is prevented and the rigidity of theeye portion 34 is improved. - At the time of assembling the
piston rod 30, theplug 17 is first mounted into theinner plug hole 15. Thereafter, thebush 9 is mounted on the innerperipheral surface 34A of theeye portion 34. Finally, theplug 18 is mounted into the outer plug hole 16. - Even if the
plug 17 is going to come out from theinner plug hole 15, such a movement is stopped by thebush 9. Thus, the detachment of theplug 17 from theinner plug hole 15 is avoided and the head-side passage 11 is maintained in a sealed state. - Since the
plugs piston rod 30 projecting out from thecylinder tube 10, even if the plug comes out from the inner orouter plug hole 15 or 16, the fall thereof into thecylinder tube 10 is avoided. - Functions and effects of the present embodiment are described below. In the present embodiment, the fluid pressure cylinder (hydraulic cylinder 1) is assumed which is expanded and contracted by the working fluid pressure introduced from the external working fluid pressure source.
- The fluid pressure cylinder (hydraulic cylinder 1) of the present embodiment includes the
tubular cylinder tube 10, thepiston 20 partitioning the interior of thecylinder tube 10 into the head-side chamber 2 and the bottom-side chamber 3 and thepiston rod 30 coupled to thepiston 20. Thesolid piston rod 30 is internally provided with the head-side passage 11 and the bottom-side passage 21. The head-side passage 11 is defined by the head-side shaft hole 12 extending in an axial direction of thepiston rod 30, the head-sideouter hole 13 connected to the head-side shaft hole 12 and open on the part of thepiston rod 30 projecting from thecylinder tube 10 and the head-sideinner hole 14 connected to the head-side shaft hole 12 and open to the head-side chamber 2, and allows the head-side chamber 2 to communicate with the working fluid pressure source via the head-sideinner hole 14, the head-side shaft hole 12 and the head-sideouter hole 13. The bottom-side passage 21 allows the bottom-side chamber 3 to communicate with the working fluid pressure source. The head-side shaft hole 12 includes the openingend 12A open on the part of thepiston rod 30 projecting from thecylinder tube 10 and thetip 12B formed inside thepiston rod 30. The fluid pressure cylinder further includes the sealing member (plug 17) for sealing the openingend 12A of the head-side shaft hole 12. - In this way, the working fluid is supplied and discharged between the head-
side chamber 2 and the working fluid pressure source via the head-side shaft hole 12, the head-sideouter hole 13 and the head-sideinner hole 14. - Since the head-
side shaft hole 12 is structured to include no opening end in the bottom-side chamber 3, a sealing member for closing the head-side shaft hole 12 and the bottom-side chamber 3 is not provided in the first place and there is no likelihood that such a sealing member or the like comes off into thecylinder tube 10. - The
tip 12B of the head-side shaft hole 12 is located closer to the openingend 12A of the head-side shaft hole 12 than the part of thepiston rod 30 supporting thepiston 20. The bottom-side passage 21 is defined by the bottom-side shaft hole 22 including the openingend 22A open to the bottom-side chamber 3 and extending in the axial direction (direction of the center axis O) of thepiston rod 30 beyond the part of thepiston rod 30 supporting thepiston 20. - Since the cross-sectional area of the part (
piston supporting portion 31, tip screw portion 32) of thepiston rod 30 supporting thepiston 20 is reduced by the bottom-side passage 21, but not reduced by the head-side shaft hole 12, a reduction in strength can be suppressed and a reduction in the diameter of thepiston rod 30 can be realized. - The conventional fluid pressure cylinder is so structured that the two shaft holes defining the head-side passage and the bottom-side passage penetrate through the piston supporting portion of the piston rod. Thus, there have been a problem that a cross-sectional area of the piston supporting portion is reduced by the two penetrating shaft holes despite the piston supporting portion being a part where the outer diameter of the piston rod is small and the strength of the piston rod is impaired. Contrary to this, since only one shaft hole penetrates through the
piston supporting portion 31 in the present embodiment, the strength of thepiston rod 30 can be improved as compared with the conventional fluid pressure cylinder. - The
piston rod 30 includes theannular eye portion 34 on the part projecting from thecylinder tube 10. Theinner plug hole 15 open on the innerperipheral surface 34A of theeye portion 34 is formed at the openingend 12A of the head-side shaft hole 12. Theplug 17 as the sealing member for sealing the openingend 12A of the head-side shaft hole 12 is embedded into theinner plug hole 15. - Since this causes the
inner plug hole 15 to be closed by thebush 9 or a pin (not shown) disposed on theeye portion 34 after theplug 17 is embedded, the detachment of theplug 17 from theinner plug hole 15 can be prevented. - In the
piston rod 30, the outer plug hole 16 open on the inner and outerperipheral surfaces eye portion 34 is formed and the outer plug hole 16, theinner plug hole 15 and the head-side shaft hole 12 are coaxially formed. - This enables the head-
side shaft hole 12 to be formed in thepiston rod 30 including theeye portion 34. - The method for manufacturing the fluid pressure cylinder (hydraulic cylinder 1) of the present embodiment includes the head-side passage forming process of forming the head-
side passage 11 by the cuttingtool 61 inserted through the part (eye portion outerperipheral surface 34B) of thepiston rod 30 projecting from thecylinder tube 10 and the bottom-side passage forming process of forming the bottom-side passage 21 by the cuttingtool 62 inserted through the part (tip surface 36) of thepiston rod 30 to be located in thecylinder tube 10. - This causes the sealed state of the head-
side passage 11 to be maintained and enables the fluid pressure cylinder (hydraulic cylinder 1) capable of improving the strength of thepiston rod 30 to be manufactured. - In the method for manufacturing the fluid pressure cylinder (hydraulic cylinder 1) of the present embodiment, the head-side passage forming process and the bottom-side passage forming process are performed in parallel.
- Since this enables the
cutting tools piston rod 30, it is possible to reduce the manufacturing time and improve productivity. - The embodiments of the present invention described above are merely illustration of some application examples of the present invention and not of the nature to limit the technical scope of the present invention to the specific constructions of the above embodiments.
Claims (5)
- A fluid pressure cylinder (1), comprising:a tubular cylinder tube (10);a piston (20) partitioning the interior of the cylinder tube (10) into a head-side chamber (2) and a bottom-side chamber (3); anda piston rod (30) coupled to the piston (20), wherein:the piston rod is solid and internally provided with a head-side passage (11) allowing communication between the head-side chamber (2) and a working fluid pressure source and a bottom-side passage (21) allowing communication between the bottom-side chamber (3) and the working fluid pressure source;
whereinthe head-side passage (11) is defined by a head-side shaft hole (12) extending in an axial direction of the piston rod (30), a head-side outer hole (13) connected to the head-side shaft hole (12) and opening on a part of the piston rod (30) projecting from the cylinder tube (10) and a head-side inner hole (14) connected to the head-side shaft hole (12) and opening to the head-side chamber (2);the head-side shaft hole (12) includes an opening end (12A) open on the part of the piston rod (30) projecting from the cylinder tube (10) and a tip (12B) formed inside the piston rod (30); andthe opening end (12A) of the head-side shaft hole (12) is sealed by a sealing member, and
whereinthe bottom-side passage (21) is defined by a bottom-side shaft hole (22) extending in the axial direction of the piston rod (30) and a bottom-side outer hole (23) connected to the bottom-side shaft hole (22) and opening on another part of the piston rod (30) projecting from the cylinder tube (10), andthe bottom-side shaft hole (22) includes an opening end (22A) open in the bottom-sidechamber (3) and a tip (22B) formed inside the piston rod (30), and characterised in that the piston rod (30) includes an annular eye portion (34) on the part projecting from the cylinder tube (10);an inner plug hole (15) open on an inner peripheral surface (34A) of the eye portion (34) is formed at the opening end (12A) of the head-side shaft hole (12); anda plug (17) is embedded as the sealing member into the inner plug hole (15). - The fluid pressure cylinder (1) according to claim 1, wherein
the tip (12B) of the head-side shaft hole (12) is located closer to the opening end (12A) of the head-side shaft hole (12) than a part of the piston rod (30) supporting the piston (20); and
the tip (22B) of the bottom-side shaft hole (22) is located on the part of the piston rod (30) projecting from the cylinder tube (10), and
an outer diameter of the part of the piston rod (30) supporting the piston (20) is set to be smaller than an outer diameter of another part of the piston rod (30). - A method for manufacturing a fluid pressure cylinder (1) in which a head-side passage (11) allowing communication between a head-side chamber (2) and a working fluid pressure source and a bottom-side passage (21) allowing communication between a bottom-side chamber (3) and the working fluid pressure source are provided in a solid piston rod (30), comprising:a head-side passage (11) forming process of forming the head-side passage (11) by a cutting tool (61) inserted through a part of the piston rod (30) projecting from a cylinder tube (10); anda bottom-side passage forming process of forming the bottom-side passage (21) by a cutting tool (62) inserted through a part of the piston rod (30) to be located in the cylinder tube (10), characterised in that the piston rod (30) includes an annular eye portion (34) on the part projecting from the cylinder tube (10);the head-side passage (11) forming process includes a process of forming a head-side shaft hole (12) including an opening end (12A) on an inner peripheral surface of the eye portion (34) by inserting a cutting tool (61) through an outer peripheral surface of the eye portion (34), and a process of sealing the opening end (12A) with a plug (17).
- The method for manufacturing the fluid pressure cylinder (1) according to claim 3, wherein the head-side passage forming process and the bottom-side passage forming process are performed in parallel.
- The fluid pressure cylinder (1) according to claim 1, wherein the tip (22B) of the bottom-side shaft hole (22) is connected to the bottom-side outer hole (23).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011240133A JP5707301B2 (en) | 2011-11-01 | 2011-11-01 | Fluid pressure cylinder and manufacturing method thereof |
PCT/JP2012/076177 WO2013065457A1 (en) | 2011-11-01 | 2012-10-10 | Hydraulic cylinder and method for manufacturing same |
Publications (3)
Publication Number | Publication Date |
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EP2775152A1 EP2775152A1 (en) | 2014-09-10 |
EP2775152A4 EP2775152A4 (en) | 2015-08-26 |
EP2775152B1 true EP2775152B1 (en) | 2018-07-04 |
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ID=48191815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12846284.3A Active EP2775152B1 (en) | 2011-11-01 | 2012-10-10 | Hydraulic cylinder and method for manufacturing same |
Country Status (6)
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US (1) | US9581242B2 (en) |
EP (1) | EP2775152B1 (en) |
JP (1) | JP5707301B2 (en) |
KR (1) | KR101601575B1 (en) |
CN (1) | CN103906932B (en) |
WO (1) | WO2013065457A1 (en) |
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JP5746281B2 (en) * | 2013-07-26 | 2015-07-08 | Kyb−Ys株式会社 | Fluid pressure cylinder |
US10321435B2 (en) | 2014-06-27 | 2019-06-11 | Qualcomm Incorporated | Method and apparatus for lightweight messaging during initial synchronization, discovery, and association in directional wireless systems |
CN104806600B (en) * | 2015-04-16 | 2017-08-08 | 徐州重型机械有限公司 | A kind of speed-changing hydraulic cylinder |
KR101822148B1 (en) * | 2015-12-10 | 2018-01-26 | 김동섭 | Hydraulic cylinder for folding backrest chair |
CN106195261B (en) * | 2016-08-30 | 2018-05-01 | 四川悦安重工机械装备有限公司 | A kind of hollow piston bar assembly for preventing pollution hydraulic oil |
DE102017105015B4 (en) * | 2017-03-09 | 2019-10-10 | Tyrolon-Schulnig Gmbh | Gripping and transport device |
CN108397439A (en) * | 2018-03-30 | 2018-08-14 | 苏州道森钻采设备股份有限公司 | A kind of movement of cylinder block type fluid pressure drive device |
CN111365319B (en) * | 2020-03-26 | 2021-02-26 | 燕山大学 | Novel hydraulic cylinder for hydraulic bulging |
CN113276599A (en) * | 2021-06-18 | 2021-08-20 | 安徽工业大学 | Electric vehicle wheel assembly capable of recycling road surface excitation energy |
FR3133651A1 (en) * | 2022-03-17 | 2023-09-22 | Jean-Michel Gerard | CYLINDER AND DOOR FORCE OPENING DEVICE USING SUCH A CYLINDER |
JP2023137714A (en) * | 2022-03-18 | 2023-09-29 | Kyb株式会社 | fluid pressure cylinder |
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DE19839142A1 (en) * | 1997-09-19 | 1999-04-01 | Smc Corp | Compressed fluid cylinder |
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US3279561A (en) * | 1964-04-23 | 1966-10-18 | James J Flanagan | Lubricant metering means for rod end bearings |
JPH0178706U (en) * | 1987-11-16 | 1989-05-26 | ||
JP2560871Y2 (en) * | 1990-01-08 | 1998-01-26 | シーケーデイ株式会社 | Fluid pressure cylinder device |
JPH10131968A (en) * | 1996-10-25 | 1998-05-22 | Hitachi Constr Mach Co Ltd | Bearing for hydraulic cylinder |
JP3827188B2 (en) * | 1999-02-24 | 2006-09-27 | カヤバ工業株式会社 | Flow path forming method in fluid pressure cylinder |
JP4651220B2 (en) * | 2001-05-07 | 2011-03-16 | 株式会社小松製作所 | Fluid cylinder with swivel joint |
JP3814525B2 (en) | 2001-11-29 | 2006-08-30 | カヤバ工業株式会社 | Hydraulic cylinder |
DE20301778U1 (en) * | 2003-02-05 | 2003-06-12 | Graf, Stephan, Dipl.-Ing.(FH), 79199 Kirchzarten | Working cylinder for robot actuator has longitudinal bore in piston rod coupled to cross bore at piston surface for flow of working fluid |
JP4490751B2 (en) * | 2004-07-16 | 2010-06-30 | セイレイ工業株式会社 | Outrigger hydraulic cylinder |
US7322273B2 (en) * | 2004-08-13 | 2008-01-29 | The Stanley Works | Piston-piston rod retaining assembly for a hydraulic piston and cylinder unit |
CN101307788A (en) * | 2008-06-23 | 2008-11-19 | 上海耐斯特液压设备有限公司 | Ultra-high hydraulic double-acting mechanical locking oil cylinder |
-
2011
- 2011-11-01 JP JP2011240133A patent/JP5707301B2/en active Active
-
2012
- 2012-10-10 WO PCT/JP2012/076177 patent/WO2013065457A1/en active Application Filing
- 2012-10-10 CN CN201280052788.XA patent/CN103906932B/en active Active
- 2012-10-10 KR KR1020147011342A patent/KR101601575B1/en active IP Right Grant
- 2012-10-10 EP EP12846284.3A patent/EP2775152B1/en active Active
- 2012-10-10 US US14/355,569 patent/US9581242B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19839142A1 (en) * | 1997-09-19 | 1999-04-01 | Smc Corp | Compressed fluid cylinder |
Also Published As
Publication number | Publication date |
---|---|
KR101601575B1 (en) | 2016-03-21 |
CN103906932A (en) | 2014-07-02 |
US20140251126A1 (en) | 2014-09-11 |
EP2775152A4 (en) | 2015-08-26 |
EP2775152A1 (en) | 2014-09-10 |
CN103906932B (en) | 2017-04-26 |
WO2013065457A1 (en) | 2013-05-10 |
KR20140063890A (en) | 2014-05-27 |
JP2013096510A (en) | 2013-05-20 |
US9581242B2 (en) | 2017-02-28 |
JP5707301B2 (en) | 2015-04-30 |
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